3. Bi/tricomponent fiber applications

3.1 Thermobonding

Core/sheath fibers are mainly used for thermal binding operations. This can have several functions, such as :

• bonding fibers together for thermal consolidation to produce a nonwoven fabric;

• join different structures together;

• manufacture molded parts.

Generally speaking, the outer part of the fiber is made of a polymer with a lower melting point than that of the inner part. Copolymers, polyethylene or polypropylene are often used for the outer part, with melting temperatures of around 120 and 160°C respectively...